We also had a slot pull for each leg of the around the horn repo on the Mariner. We had about 70 for each one and did not let anyone else join.
Work with the Casino Manager. He might give you something. He gave us our own slot tournament. He might give you a raffle. During your tournament, have him there and recognize. Tell him you will mention him in your comments after the cruise and how helpful he was. He will work with you.